Aww bless them!
If those pictures are of Summer's udder after exercise then she looks as though she's making great progress. I'm sorry but I cant remember if she's a maiden mare or not. If she is, then I think her tummy is looking quite good too! I know she looks as though she has quite a while to go yet but these maidens can be a funny lot - some making you wait for ages and some catching you totally unawares. I know that you are keeping a really good eye on her, but just watch for all the possible signs that she might be getting close and not just her udder and her tummy.
Have you been able to bring her back home yet - and will she and Dove be living together when you do - they are such sweet pair!